当前位置: X-MOL 学术Eng. Struct. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
A multi-stage mesoscopic numerical approach to simulate the flexural behavior of concrete beams with corroded rebars
Engineering Structures ( IF 5.5 ) Pub Date : 2021-08-04 , DOI: 10.1016/j.engstruct.2021.112913
Liu Jin , Hongshen Yang , Renbo Zhang , Xiuli Du

Corrosion is the main factor affecting the service performance of reinforced concrete (RC) structures, especially in offshore or coastal areas. In this paper, taking RC beam as the research object, a three-dimensional meso-scale numerical model involving rebar corrosion was established. The corrosion effects on the mechanical behavior of RC beam was explored through a multi-stage analysis method (namely, corrosion induced expansion stage and structural deterioration stage). The non-uniform radial displacement was applied to concrete around the steel to simulate the expansion of rebar corrosion. The cracking process and the damage pattern of concrete caused by corrosion can be obtained. Then, taking this state as the initial condition, the mechanical analysis of corroded RC beam was carried out. The agreement between the numerical and the test results validates the rationality and correctness of the multi-stage analysis model. According to the simulation results, the concrete damage due to corrosion is mainly concentrated in the diagonal of reinforcement and the middle of adjacent reinforcement. The rust expansion pressure increases gradually when the corrosion level increased. For severely corroded beams, the concrete strain no longer conforms to the plane section assumption. In addition, corrosion reduces the bearing capacity and ductility of the beams. The coupling effects of corrosion of tensile and compression bars on the performance of the beam are more serious than that of only corrosion of tensile bars. Based on the data regression, a relationship to evaluate the bearing capacity of beams was established. It indicates that the flexural bearing capacity decreases by about 1.4%, 1.7% annually in the conditions of tensile reinforcement corroded only and both tensile and compressive reinforcement corroded.



中文翻译:

模拟钢筋锈蚀混凝土梁弯曲行为的多级细观数值方法

腐蚀是影响钢筋混凝土(RC)结构使用性能的主要因素,尤其是在近海或沿海地区。本文以钢筋混凝土梁为研究对象,建立了涉及钢筋腐蚀的三维细观数值模型。通过多阶段分析方法(即腐蚀膨胀阶段和结构恶化阶段)探索腐蚀对钢筋混凝土梁力学行为的影响。非均匀径向位移应用于钢筋周围的混凝土以模拟钢筋腐蚀的扩展。可以获得混凝土的开裂过程和腐蚀引起的破坏模式。然后,以此状态为初始条件,对锈蚀钢筋混凝土梁进行力学分析。数值与试验结果一致,验证了多阶段分析模型的合理性和正确性。根据模拟结果,混凝土腐蚀破坏主要集中在钢筋的对角线和相邻钢筋的中间。随着腐蚀程度的增加,锈蚀膨胀压力逐渐增大。对于严重腐蚀的梁,混凝土应变不再符合平面截面假设。此外,腐蚀会降低梁的承载能力和延展性。受拉杆和受压杆腐蚀对梁性能的耦合效应比仅受拉杆腐蚀更严重。在数据回归的基础上,建立了梁的承载力评价关系。

更新日期:2021-08-04
down
wechat
bug